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viewRotationAngle

The angle, in degrees, to rotate a view by so the ARFrame it displays stays level with the horizon as the device rotates.

Declaration

@nonobjc var viewRotationAngle: CGFloat? { get }

Discussion

Updates in step with the system UI rotation. The value is normalized to [0, 360) (0 at LandscapeRight, 90 at Portrait, 180 at LandscapeLeft, 270 at PortraitUpsideDown), or nil until the angle is available (viewLayer is set and on screen). Read it on demand; implement session(_:didChangeViewRotationAngle:) to react to changes.